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  1. A system in stratigraphy is a sequence of strata (rock layers) that were laid down together within the same corresponding geological period. The associated period is a chronological time unit, a part of the geological time scale, while the system is a unit of chronostratigraphy.
    en.wikipedia.org/wiki/System_(stratigraphy)
    A system is a unit of major rank in the conventional chronostratigraphic hierarchy, above a series and below an erathem. A system is composed of several consecutive series. The geochronologic equivalent of a system is a period. As an exception, the rank of subsystem (Mississippian, Pennsylvanian) is used for the Carboniferous System.
    stratigraphy.org/guide/chron
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  8. Seismic stratigraphy - SEG Wiki

    System tracts are associated with seismic stratigraphy and eustacy. A system tract is an indicator of the deposition sequences that would be present within a sea level cycle. They fall into three categories. 1. Low System Tract (LST): …

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  11. Systems tracts identification - AAPG Wiki

    Feb 23, 2022 · Identifying a depositional systems tract can be achieved by analyzing seismic geometries (Figures 1 and 2), wireline log motifs (Figure 3), and biostratigraphic data (Figures 4 and 5). Carefully integrating multiple …

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